NotSupportedException during HTTP Post - EndGetRequestStream

If you're making an HTTP Post on WP7/WP8 and you get back an annoying NotSupportedException, then one thing i might be is that you forgot to Flush/Close/Dispose the Request stream.

i.e. make sure that you do the `using` part of:

	client.BeginGetRequestStream(state =>
	{
	try
	{
	using (var dataStream = client.EndGetRequestStream(state))
	{
	dataStream.Write(postData, 0, postData.Length);
	dataStream.Flush();
	}
	client.BeginGetResponse(respState =>
	{
	try
	{
	var response = client.EndGetResponse(respState);
	// ...

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